If I were you, I would avoid using any document which still has her maiden name as far as possible
I would have Used birth certificate or school leaving certificate instead which anyways were supposed to only have maiden name forever
In the mean time get the name updated in PAN and Aadhaar ASAp
It's an easy and quick process and I am surprised you have not done it so far
As far as the question on answering if she was known by any other name, you have to give her maiden name where ever asked
Cheers